As the aforementioned "friend," I thought I would chip a little more detail about the preferred trades. Out of five trades I've received four of them were in my actively sought set and the last was from a different set.
We also discovered further evidence to support the "one download per upload" theory. We have both had it occur that we updated Near and received a Game Good offer, but were refused the right to actually DOWNLOAD the good, informed that it was "no longer available." The theory is that this would be a result of being "sniped," with someone else downloading it in the few seconds between connecting to Near and attempting to download it ourselves.